[PATCH] Reassociate: optimize I1 + x - I2 into x when I1 and I2 are identical

[Chad Rosier]

Certainly. :)

I'm a bit overwhelmed at the moment, but I hope to get to this today.

 Chad

>
> Chad, could you take a look?
>
>> On Sep 24, 2014, at 3:49 PM, Dmitri Shtilman <dshtilman at icloud.com>
>> wrote:
>>
>> Hi all,
>>
>> The following small patch gives the Reassociate pass a bit more
>> flexibility and autonomy when optimizing expressions.
>> Particularly, it addresses cases where Reassociate breaks Subtracts but
>> then fails to optimize combinations like I1 + -I2 where I1 and I2 have
>> the same rank and are identical.
>>
>> Please review.
>> Dmitri
>>
>> <Reassociate.patch>
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>